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406 HDI coolant loss problem

Lazarus79

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PostPosted: Sat 05 Jun, 2010 10:56 am Reply with quote
Hi,

newbie here! I just bought a 406 2.0HDI 90 on a 2002 (02) with a strange water loss problem. I got it cheap (900) so room for money to fix it!

Bein a mechanic i took it down my garage and put the coolant pressure tester on it. Sure enough pressure was lost slightly, but no leaks became evident. I then put the sniffer on the coolant bottle, but no colour change.

It loses about a pint every 50-100 miles, but not if its stationary and you just rev it up till the fan comes on. There is no evidence of any leaks. There is no steam/mist/smell or signs of matrix problems. It does not over heat.

However, and this is what i wanted to check with other owners, after a normal drive up to temperature etc and then let it cool down say overnight, when yoiu come back to it stone cold the next day and remove the coolant bottle cap it releases pressure. Is this normal for the hdi lump? Also the coolant hoses when the car is upto running temperature are definatly swelling and under pressure, until the cap is taken off as before, when they return to what i would deem normal. But where is the water going? the exhaust doesnt steam so its not entering the cylinders. there is no oil in the water and no water in the oil.

Is it possible this is the head gasket?  it does not overheat and the sniffer came back negative?

very strange, i would appreciate help from people with more knowledge of this engine then me!!

many thanks
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Re: 406 HDI coolant loss problem

GazHill

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Joined: Apr 28, 2009 Posts: 224 Location: Wigan , Lancashire 1998 Peugeot 406 Mpg: 38.39
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PostPosted: Sat 05 Jun, 2010 5:53 pm Reply with quote
check the radiator and all the pipes, ive just changed my radiator, it had all rotton at the bottom and was very rusty,
also check the thermostat housing and the thermostat  Cool
usually the thermostats seal goes ,
after a good few miles run get out the car when the engine is red hot and get under it look for signs of water from them area's
the bottom hose on the rad - check that also
the problem will probably be the rad , headgaskets dont go that often on 406's
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Re: 406 HDI coolant loss problem

Lazarus79

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What Peugeot do you own?: 406
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Age: 31
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PostPosted: Sat 05 Jun, 2010 6:08 pm Reply with quote
update::

The coolant loss is blowing from the coolant bottle cap and level sensor after a run out, but not when revved up not driving. I can only assume this is head gasket causing this pressure?
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Re: 406 HDI coolant loss problem

BennyC

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PostPosted: Sun 06 Jun, 2010 9:00 pm Reply with quote
ive done quite a few head gaskets on the 2.0 hdi with the same symptons, the gasket goes around cylinder 2 and pressurises the cooling system.
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Re: 406 HDI coolant loss problem

Crow

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Joined: Oct 28, 2007 Posts: 1738 Location: Swindon / Wiltshire Berkshire border Posts Left: 0
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PostPosted: Tue 08 Jun, 2010 7:34 pm Reply with quote
Hi

im with Benny , does sound like early headgasket issues , ive been asked by customers in the past to just fit a gasket and not skim or pressure test ( which down this way is a rip) and ive had no trouble , if you catch em early you may be ok

Crow
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Re: 406 HDI coolant loss problem

Lazarus79

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PostPosted: Wed 09 Jun, 2010 10:32 am Reply with quote
ok, thanks for your help guys. Kinda confirming my suspicions I cant think of anything else that would cause the pressure. If it was a blockage somewhere like rad/thermo etc it would overheat, particularly at high speeds etc.
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Re: 406 HDI coolant loss problem

chris.hd

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PostPosted: Thu 01 Jul, 2010 7:10 pm Reply with quote
Hi, iv had the exact same problem!

The fix was a new cap from Pug at 3.50!

This car has a pressure system, the pipes get hard when hot, this is normal, took me ages to find the problem, Barr's leak suff left a nasty brown stain on the black filler bottle.

Check the O ring has not mover out its groove and is still there.........do not have the head done untill you spent 3.50!!!!!!!!!!!!!!!!!!!!!!!!!

Chris
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Re: 406 HDI coolant loss problem

Lazarus79

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PostPosted: Thu 01 Jul, 2010 10:21 pm Reply with quote
hi, yeah the cap had already been changed the pressure is too great to just be this. I changed the cylinder head gasket 2 weeks ago ish now and this was the problem, exactly as described small pitting between cyl 2 and the water jacket. Incidentelly you may find that the signs from your cap is just the start of the same problem i had here as speaking with other garage fellows this is a common problem. It only cost me around 90 for parts as fixed it myself.
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Re: 406 HDI coolant loss problem

scorpionking

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PostPosted: Fri 09 Mar, 2012 9:07 pm Reply with quote
Hi, at the moment I am having the same problem, when cold a build up of pressure in expansion tank. I took to peugeot for the cambelt and they said they suspect the head gasket is failing. They told me that the engine needs to come out for the head gasket to be done. And want to charge over £600. I not sure if there telling the truth about taking engine out would anybody know on here. Sorry to hijack your thread.

kev
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Re: 406 HDI coolant loss problem

Lazarus79

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What Peugeot do you own?: 406
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Age: 31
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Insurance renewal month: January

PostPosted: Sat 10 Mar, 2012 10:36 am Reply with quote
Hi it will be the head gasket, it always is, between cylinders 2 and 3 fine hairline cracks in the gasket. Unless you have over heated the car it wont need a skim of the head. And no the job can be done with the engine in the car totally fine. The head gasket set for a goodun will cost about £100 its good practice to change the timing belt kit also about £100. It should take in total about 8 hours to do.
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